K2-18b, an exoplanet 120 light-years away, may be the best hope to confirm that life exists beyond Earth. Here's what to know ...

A new AI model from the University of Bern predicts planetary systems likely to host Earth-like planets. It could boost the ...

International Space Station cameras pointing at Earth have captured huge, mysterious writing etched onto the surface of the planet.

Of all the asteroids that become meteoroids by striking Earth's surface, only 4% contain abundant carbon. But scientists know ...

Even the oldest and most stable of lithospheric structures can’t withstand geologic machinations deep within the Earth.

The sun may rise every morning, but the amount of sunlight reaching Earth's surface can substantially vary over decades, ...

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...